Question

which clue can be used to identify a chemical reaction as a combustion reaction?
o oxygen is a product.
o a hydrocarbon reacts with oxygen.
o water and carbon dioxide react.
o the reaction involves ions.

Explanation:

Combustion reactions are defined as reactions where a hydrocarbon reacts with oxygen. Oxygen is a reactant (not a product) in combustion. Water and carbon dioxide are usually products (not reactants) in hydrocarbon combustion. Reactions involving ions are not a characteristic of combustion reactions.

Answer:

A hydrocarbon reacts with oxygen.